Pin outs for AT power supply

twins22 · 10-29-1999, 11:46 AM

Could someone please give the voltage assignments for the motherboard connectors for an AT type power supply? I am ready to complete my DC - DC project except for this part. Thanks.

snakebite · 10-30-1999, 01:43 AM

With the key facing toward you,you have.....
+5v,+5v,+5v,-5v,G,G,G,G,-12v,+12v,+5v,PG(+5v via a 5k resistor). Hope this helps.

twins22 · 10-31-1999, 09:12 AM

Thanks a bunch snakebite, that's exactly what I needed!

tenfoot · 11-01-1999, 02:08 PM

OK, I've got the supply built, but what's the
PG wire for (I assume this is power good?).
Is this a signal from the PSU to motherboard or from motherboard to PSU?
Cheers.

jjohnson · 11-01-1999, 02:48 PM

PG is a signal from the PSU to the MB, telling the MB that everything is OK (all voltages are good and within regulation) and it's safe to boot.

You can tie this to +5V through a resistor (1k - 5k works fine) to "fake" the PG signal. Some motherboards won't boot without this tied high, while others don't seem to care either way.

--Jason
http://jump.to/m2pc

spud42 · 11-02-1999, 08:01 AM

for at and atx power connection pinouts try this site
http://www.upgradeyourpc.com/powersupplyconn.htm

even has disk drive power connectors

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